/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.manager;

import org.apache.catalina.util.RequestUtil;
import org.apache.tomcat.util.ExceptionUtils;

import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.lang.management.ManagementFactory;
import java.lang.management.MemoryPoolMXBean;
import java.lang.management.MemoryUsage;
import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.*;

/**
 * This is a refactoring of the servlet to externalize
 * the output into a simple class. Although we could
 * use XSLT, that is unnecessarily complex.
 *
 * @author Peter Lin
 */
public class StatusTransformer {


	// --------------------------------------------------------- Public Methods

	public static void setContentType(HttpServletResponse response,
	                                  int mode) {
		if (mode == 0) {
			response.setContentType("text/html;charset=" + Constants.CHARSET);
		} else if (mode == 1) {
			response.setContentType("text/xml;charset=" + Constants.CHARSET);
		}
	}

	/**
	 * Write an HTML or XML header.
	 *
	 * @param writer the PrintWriter to use
	 * @param args   Path prefix for URLs
	 * @param mode   - 0 = HTML header, 1 = XML declaration
	 */
	public static void writeHeader(PrintWriter writer, Object[] args, int mode) {
		if (mode == 0) {
			// HTML Header Section
			writer.print(Constants.HTML_HEADER_SECTION);
		} else if (mode == 1) {
			writer.write(Constants.XML_DECLARATION);
			writer.print(MessageFormat.format
					(Constants.XML_STYLE, args));
			writer.write("<status>");
		}
	}

	/**
	 * Write the header body. XML output doesn't bother
	 * to output this stuff, since it's just title.
	 *
	 * @param writer The output writer
	 * @param args   What to write
	 * @param mode   0 means write
	 */
	public static void writeBody(PrintWriter writer, Object[] args, int mode) {
		if (mode == 0) {
			writer.print(MessageFormat.format
					(Constants.BODY_HEADER_SECTION, args));
		}
	}

	/**
	 * Write the manager webapp information.
	 *
	 * @param writer The output writer
	 * @param args   What to write
	 * @param mode   0 means write
	 */
	public static void writeManager(PrintWriter writer, Object[] args,
	                                int mode) {
		if (mode == 0) {
			writer.print(MessageFormat.format(Constants.MANAGER_SECTION, args));
		}
	}

	public static void writePageHeading(PrintWriter writer, Object[] args,
	                                    int mode) {
		if (mode == 0) {
			writer.print(MessageFormat.format
					(Constants.SERVER_HEADER_SECTION, args));
		}
	}

	public static void writeServerInfo(PrintWriter writer, Object[] args,
	                                   int mode) {
		if (mode == 0) {
			writer.print(MessageFormat.format(Constants.SERVER_ROW_SECTION, args));
		}
	}

	/**
	 *
	 */
	public static void writeFooter(PrintWriter writer, int mode) {
		if (mode == 0) {
			// HTML Tail Section
			writer.print(Constants.HTML_TAIL_SECTION);
		} else if (mode == 1) {
			writer.write("</status>");
		}
	}

	/**
	 * Write the OS state. Mode 0 will generate HTML.
	 * Mode 1 will generate XML.
	 */
	public static void writeOSState(PrintWriter writer, int mode) {
		long[] result = new long[16];
		boolean ok = false;
		try {
			String methodName = "info";
			Class<?> paramTypes[] = new Class[1];
			paramTypes[0] = result.getClass();
			Object paramValues[] = new Object[1];
			paramValues[0] = result;
			Method method = Class.forName("org.apache.tomcat.jni.OS")
					.getMethod(methodName, paramTypes);
			method.invoke(null, paramValues);
			ok = true;
		} catch (Throwable t) {
			t = ExceptionUtils.unwrapInvocationTargetException(t);
			ExceptionUtils.handleThrowable(t);
		}

		if (ok) {
			if (mode == 0) {
				writer.print("<h1>OS</h1>");

				writer.print("<p>");
				writer.print(" Physical memory: ");
				writer.print(formatSize(Long.valueOf(result[0]), true));
				writer.print(" Available memory: ");
				writer.print(formatSize(Long.valueOf(result[1]), true));
				writer.print(" Total page file: ");
				writer.print(formatSize(Long.valueOf(result[2]), true));
				writer.print(" Free page file: ");
				writer.print(formatSize(Long.valueOf(result[3]), true));
				writer.print(" Memory load: ");
				writer.print(Long.valueOf(result[6]));
				writer.print("<br>");
				writer.print(" Process kernel time: ");
				writer.print(formatTime(Long.valueOf(result[11] / 1000), true));
				writer.print(" Process user time: ");
				writer.print(formatTime(Long.valueOf(result[12] / 1000), true));
				writer.print("</p>");
			} else if (mode == 1) {
				// NO-OP
			}
		}

	}

	/**
	 * Write the VM state. Mode 0 will generate HTML.
	 * Mode 1 will generate XML.
	 */
	public static void writeVMState(PrintWriter writer, int mode)
			throws Exception {

		SortedMap<String, MemoryPoolMXBean> memoryPoolMBeans =
				new TreeMap<String, MemoryPoolMXBean>();
		for (MemoryPoolMXBean mbean : ManagementFactory.getMemoryPoolMXBeans()) {
			String sortKey = mbean.getType() + ":" + mbean.getName();
			memoryPoolMBeans.put(sortKey, mbean);
		}

		if (mode == 0) {
			writer.print("<h1>JVM</h1>");

			writer.print("<p>");
			writer.print(" Free memory: ");
			writer.print(formatSize(
					Long.valueOf(Runtime.getRuntime().freeMemory()), true));
			writer.print(" Total memory: ");
			writer.print(formatSize(
					Long.valueOf(Runtime.getRuntime().totalMemory()), true));
			writer.print(" Max memory: ");
			writer.print(formatSize(
					Long.valueOf(Runtime.getRuntime().maxMemory()), true));
			writer.print("</p>");

			writer.write("<table border=\"0\"><thead><tr><th>Memory Pool</th><th>Type</th><th>Initial</th><th>Total</th><th>Maximum</th><th>Used</th></tr></thead><tbody>");
			for (MemoryPoolMXBean memoryPoolMBean : memoryPoolMBeans.values()) {
				MemoryUsage usage = memoryPoolMBean.getUsage();
				writer.write("<tr><td>");
				writer.print(memoryPoolMBean.getName());
				writer.write("</td><td>");
				writer.print(memoryPoolMBean.getType());
				writer.write("</td><td>");
				writer.print(formatSize(Long.valueOf(usage.getInit()), true));
				writer.write("</td><td>");
				writer.print(formatSize(Long.valueOf(usage.getCommitted()), true));
				writer.write("</td><td>");
				writer.print(formatSize(Long.valueOf(usage.getMax()), true));
				writer.write("</td><td>");
				writer.print(formatSize(Long.valueOf(usage.getUsed()), true));
				if (usage.getMax() > 0) {
					writer.write(" ("
							+ (usage.getUsed() * 100 / usage.getMax()) + "%)");
				}
				writer.write("</td></tr>");
			}
			writer.write("</tbody></table>");
		} else if (mode == 1) {
			writer.write("<jvm>");

			writer.write("<memory");
			writer.write(" free='" + Runtime.getRuntime().freeMemory() + "'");
			writer.write(" total='" + Runtime.getRuntime().totalMemory() + "'");
			writer.write(" max='" + Runtime.getRuntime().maxMemory() + "'/>");

			for (MemoryPoolMXBean memoryPoolMBean : memoryPoolMBeans.values()) {
				MemoryUsage usage = memoryPoolMBean.getUsage();
				writer.write("<memorypool");
				writer.write(" name='" + memoryPoolMBean.getName() + "'");
				writer.write(" type='" + memoryPoolMBean.getType() + "'");
				writer.write(" usageInit='" + usage.getInit() + "'");
				writer.write(" usageCommitted='" + usage.getCommitted() + "'");
				writer.write(" usageMax='" + usage.getMax() + "'");
				writer.write(" usageUsed='" + usage.getUsed() + "'/>");
			}

			writer.write("</jvm>");
		}

	}

	/**
	 * Write connector state.
	 */
	public static void writeConnectorState(PrintWriter writer,
	                                       ObjectName tpName, String name, MBeanServer mBeanServer,
	                                       Vector<ObjectName> globalRequestProcessors,
	                                       Vector<ObjectName> requestProcessors, int mode) throws Exception {

		if (mode == 0) {
			writer.print("<h1>");
			writer.print(name);
			writer.print("</h1>");

			writer.print("<p>");
			writer.print(" Max threads: ");
			writer.print(mBeanServer.getAttribute(tpName, "maxThreads"));
			writer.print(" Current thread count: ");
			writer.print(mBeanServer.getAttribute(tpName, "currentThreadCount"));
			writer.print(" Current thread busy: ");
			writer.print(mBeanServer.getAttribute(tpName, "currentThreadsBusy"));
			try {
				Object value = mBeanServer.getAttribute(tpName, "keepAliveCount");
				writer.print(" Keep alive sockets count: ");
				writer.print(value);
			} catch (Exception e) {
				// Ignore
			}

			writer.print("<br>");

			ObjectName grpName = null;

			Enumeration<ObjectName> enumeration =
					globalRequestProcessors.elements();
			while (enumeration.hasMoreElements()) {
				ObjectName objectName = enumeration.nextElement();
				if (name.equals(objectName.getKeyProperty("name"))) {
					grpName = objectName;
				}
			}

			if (grpName == null) {
				return;
			}

			writer.print(" Max processing time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(grpName, "maxTime"), false));
			writer.print(" Processing time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(grpName, "processingTime"), true));
			writer.print(" Request count: ");
			writer.print(mBeanServer.getAttribute(grpName, "requestCount"));
			writer.print(" Error count: ");
			writer.print(mBeanServer.getAttribute(grpName, "errorCount"));
			writer.print(" Bytes received: ");
			writer.print(formatSize(mBeanServer.getAttribute
					(grpName, "bytesReceived"), true));
			writer.print(" Bytes sent: ");
			writer.print(formatSize(mBeanServer.getAttribute
					(grpName, "bytesSent"), true));
			writer.print("</p>");

			writer.print("<table border=\"0\"><tr><th>Stage</th><th>Time</th><th>B Sent</th><th>B Recv</th><th>Client (Forwarded)</th><th>Client (Actual)</th><th>VHost</th><th>Request</th></tr>");

			enumeration = requestProcessors.elements();
			while (enumeration.hasMoreElements()) {
				ObjectName objectName = enumeration.nextElement();
				if (name.equals(objectName.getKeyProperty("worker"))) {
					writer.print("<tr>");
					writeProcessorState(writer, objectName, mBeanServer, mode);
					writer.print("</tr>");
				}
			}

			writer.print("</table>");

			writer.print("<p>");
			writer.print("P: Parse and prepare request S: Service F: Finishing R: Ready K: Keepalive");
			writer.print("</p>");
		} else if (mode == 1) {
			writer.write("<connector name='" + name + "'>");

			writer.write("<threadInfo ");
			writer.write(" maxThreads=\"" + mBeanServer.getAttribute(tpName, "maxThreads") + "\"");
			writer.write(" currentThreadCount=\"" + mBeanServer.getAttribute(tpName, "currentThreadCount") + "\"");
			writer.write(" currentThreadsBusy=\"" + mBeanServer.getAttribute(tpName, "currentThreadsBusy") + "\"");
			writer.write(" />");

			ObjectName grpName = null;

			Enumeration<ObjectName> enumeration =
					globalRequestProcessors.elements();
			while (enumeration.hasMoreElements()) {
				ObjectName objectName = enumeration.nextElement();
				if (name.equals(objectName.getKeyProperty("name"))) {
					grpName = objectName;
				}
			}

			if (grpName != null) {

				writer.write("<requestInfo ");
				writer.write(" maxTime=\"" + mBeanServer.getAttribute(grpName, "maxTime") + "\"");
				writer.write(" processingTime=\"" + mBeanServer.getAttribute(grpName, "processingTime") + "\"");
				writer.write(" requestCount=\"" + mBeanServer.getAttribute(grpName, "requestCount") + "\"");
				writer.write(" errorCount=\"" + mBeanServer.getAttribute(grpName, "errorCount") + "\"");
				writer.write(" bytesReceived=\"" + mBeanServer.getAttribute(grpName, "bytesReceived") + "\"");
				writer.write(" bytesSent=\"" + mBeanServer.getAttribute(grpName, "bytesSent") + "\"");
				writer.write(" />");

				writer.write("<workers>");
				enumeration = requestProcessors.elements();
				while (enumeration.hasMoreElements()) {
					ObjectName objectName = enumeration.nextElement();
					if (name.equals(objectName.getKeyProperty("worker"))) {
						writeProcessorState(writer, objectName, mBeanServer, mode);
					}
				}
				writer.write("</workers>");
			}

			writer.write("</connector>");
		}

	}

	/**
	 * Write processor state.
	 */
	protected static void writeProcessorState(PrintWriter writer,
	                                          ObjectName pName,
	                                          MBeanServer mBeanServer,
	                                          int mode)
			throws Exception {

		Integer stageValue =
				(Integer) mBeanServer.getAttribute(pName, "stage");
		int stage = stageValue.intValue();
		boolean fullStatus = true;
		boolean showRequest = true;
		String stageStr = null;

		switch (stage) {

			case (1/*org.apache.coyote.Constants.STAGE_PARSE*/):
				stageStr = "P";
				fullStatus = false;
				break;
			case (2/*org.apache.coyote.Constants.STAGE_PREPARE*/):
				stageStr = "P";
				fullStatus = false;
				break;
			case (3/*org.apache.coyote.Constants.STAGE_SERVICE*/):
				stageStr = "S";
				break;
			case (4/*org.apache.coyote.Constants.STAGE_ENDINPUT*/):
				stageStr = "F";
				break;
			case (5/*org.apache.coyote.Constants.STAGE_ENDOUTPUT*/):
				stageStr = "F";
				break;
			case (7/*org.apache.coyote.Constants.STAGE_ENDED*/):
				stageStr = "R";
				fullStatus = false;
				break;
			case (6/*org.apache.coyote.Constants.STAGE_KEEPALIVE*/):
				stageStr = "K";
				fullStatus = true;
				showRequest = false;
				break;
			case (0/*org.apache.coyote.Constants.STAGE_NEW*/):
				stageStr = "R";
				fullStatus = false;
				break;
			default:
				// Unknown stage
				stageStr = "?";
				fullStatus = false;

		}

		if (mode == 0) {
			writer.write("<td><strong>");
			writer.write(stageStr);
			writer.write("</strong></td>");

			if (fullStatus) {
				writer.write("<td>");
				writer.print(formatTime(mBeanServer.getAttribute
						(pName, "requestProcessingTime"), false));
				writer.write("</td>");
				writer.write("<td>");
				if (showRequest) {
					writer.print(formatSize(mBeanServer.getAttribute
							(pName, "requestBytesSent"), false));
				} else {
					writer.write("?");
				}
				writer.write("</td>");
				writer.write("<td>");
				if (showRequest) {
					writer.print(formatSize(mBeanServer.getAttribute
									(pName, "requestBytesReceived"),
							false));
				} else {
					writer.write("?");
				}
				writer.write("</td>");
				writer.write("<td>");
				writer.print(filter(mBeanServer.getAttribute
						(pName, "remoteAddrForwarded")));
				writer.write("</td>");
				writer.write("<td>");
				writer.print(filter(mBeanServer.getAttribute
						(pName, "remoteAddr")));
				writer.write("</td>");
				writer.write("<td nowrap>");
				writer.write(filter(mBeanServer.getAttribute
						(pName, "virtualHost")));
				writer.write("</td>");
				writer.write("<td nowrap class=\"row-left\">");
				if (showRequest) {
					writer.write(filter(mBeanServer.getAttribute
							(pName, "method")));
					writer.write(" ");
					writer.write(filter(mBeanServer.getAttribute
							(pName, "currentUri")));
					String queryString = (String) mBeanServer.getAttribute
							(pName, "currentQueryString");
					if ((queryString != null) && (!queryString.equals(""))) {
						writer.write("?");
						writer.print(RequestUtil.filter(queryString));
					}
					writer.write(" ");
					writer.write(filter(mBeanServer.getAttribute
							(pName, "protocol")));
				} else {
					writer.write("?");
				}
				writer.write("</td>");
			} else {
				writer.write("<td>?</td><td>?</td><td>?</td><td>?</td><td>?</td><td>?</td>");
			}
		} else if (mode == 1) {
			writer.write("<worker ");
			writer.write(" stage=\"" + stageStr + "\"");

			if (fullStatus) {
				writer.write(" requestProcessingTime=\""
						+ mBeanServer.getAttribute
						(pName, "requestProcessingTime") + "\"");
				writer.write(" requestBytesSent=\"");
				if (showRequest) {
					writer.write("" + mBeanServer.getAttribute
							(pName, "requestBytesSent"));
				} else {
					writer.write("0");
				}
				writer.write("\"");
				writer.write(" requestBytesReceived=\"");
				if (showRequest) {
					writer.write("" + mBeanServer.getAttribute
							(pName, "requestBytesReceived"));
				} else {
					writer.write("0");
				}
				writer.write("\"");
				writer.write(" remoteAddr=\""
						+ filter(mBeanServer.getAttribute
						(pName, "remoteAddr")) + "\"");
				writer.write(" virtualHost=\""
						+ filter(mBeanServer.getAttribute
						(pName, "virtualHost")) + "\"");

				if (showRequest) {
					writer.write(" method=\""
							+ filter(mBeanServer.getAttribute
							(pName, "method")) + "\"");
					writer.write(" currentUri=\""
							+ filter(mBeanServer.getAttribute
							(pName, "currentUri")) + "\"");

					String queryString = (String) mBeanServer.getAttribute
							(pName, "currentQueryString");
					if ((queryString != null) && (!queryString.equals(""))) {
						writer.write(" currentQueryString=\""
								+ RequestUtil.filter(queryString) + "\"");
					} else {
						writer.write(" currentQueryString=\"&#63;\"");
					}
					writer.write(" protocol=\""
							+ filter(mBeanServer.getAttribute
							(pName, "protocol")) + "\"");
				} else {
					writer.write(" method=\"&#63;\"");
					writer.write(" currentUri=\"&#63;\"");
					writer.write(" currentQueryString=\"&#63;\"");
					writer.write(" protocol=\"&#63;\"");
				}
			} else {
				writer.write(" requestProcessingTime=\"0\"");
				writer.write(" requestBytesSent=\"0\"");
				writer.write(" requestBytesReceived=\"0\"");
				writer.write(" remoteAddr=\"&#63;\"");
				writer.write(" virtualHost=\"&#63;\"");
				writer.write(" method=\"&#63;\"");
				writer.write(" currentUri=\"&#63;\"");
				writer.write(" currentQueryString=\"&#63;\"");
				writer.write(" protocol=\"&#63;\"");
			}
			writer.write(" />");
		}

	}

	/**
	 * Write applications state.
	 */
	public static void writeDetailedState(PrintWriter writer,
	                                      MBeanServer mBeanServer, int mode)
			throws Exception {

		if (mode == 0) {
			ObjectName queryHosts = new ObjectName("*:j2eeType=WebModule,*");
			Set<ObjectName> hostsON = mBeanServer.queryNames(queryHosts, null);

			// Navigation menu
			writer.print("<h1>");
			writer.print("Application list");
			writer.print("</h1>");

			writer.print("<p>");
			int count = 0;
			Iterator<ObjectName> iterator = hostsON.iterator();
			while (iterator.hasNext()) {
				ObjectName contextON = iterator.next();
				String webModuleName = contextON.getKeyProperty("name");
				if (webModuleName.startsWith("//")) {
					webModuleName = webModuleName.substring(2);
				}
				int slash = webModuleName.indexOf('/');
				if (slash == -1) {
					count++;
					continue;
				}

				writer.print("<a href=\"#" + (count++) + ".0\">");
				writer.print(filter(webModuleName));
				writer.print("</a>");
				if (iterator.hasNext()) {
					writer.print("<br>");
				}

			}
			writer.print("</p>");

			// Webapp list
			count = 0;
			iterator = hostsON.iterator();
			while (iterator.hasNext()) {
				ObjectName contextON = iterator.next();
				writer.print("<a class=\"A.name\" name=\""
						+ (count++) + ".0\">");
				writeContext(writer, contextON, mBeanServer, mode);
			}

		} else if (mode == 1) {
			// for now we don't write out the Detailed state in XML
		}

	}

	/**
	 * Write context state.
	 */
	protected static void writeContext(PrintWriter writer,
	                                   ObjectName objectName,
	                                   MBeanServer mBeanServer, int mode)
			throws Exception {

		if (mode == 0) {
			String webModuleName = objectName.getKeyProperty("name");
			String name = webModuleName;
			if (name == null) {
				return;
			}

			String hostName = null;
			String contextName = null;
			if (name.startsWith("//")) {
				name = name.substring(2);
			}
			int slash = name.indexOf('/');
			if (slash != -1) {
				hostName = name.substring(0, slash);
				contextName = name.substring(slash);
			} else {
				return;
			}

			ObjectName queryManager = new ObjectName
					(objectName.getDomain() + ":type=Manager,context=" + contextName
							+ ",host=" + hostName + ",*");
			Set<ObjectName> managersON =
					mBeanServer.queryNames(queryManager, null);
			ObjectName managerON = null;
			Iterator<ObjectName> iterator2 = managersON.iterator();
			while (iterator2.hasNext()) {
				managerON = iterator2.next();
			}

			ObjectName queryJspMonitor = new ObjectName
					(objectName.getDomain() + ":type=JspMonitor,WebModule=" +
							webModuleName + ",*");
			Set<ObjectName> jspMonitorONs =
					mBeanServer.queryNames(queryJspMonitor, null);

			// Special case for the root context
			if (contextName.equals("/")) {
				contextName = "";
			}

			writer.print("<h1>");
			writer.print(filter(name));
			writer.print("</h1>");
			writer.print("</a>");

			writer.print("<p>");
			Object startTime = mBeanServer.getAttribute(objectName,
					"startTime");
			writer.print(" Start time: " +
					new Date(((Long) startTime).longValue()));
			writer.print(" Startup time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "startupTime"), false));
			writer.print(" TLD scan time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "tldScanTime"), false));
			if (managerON != null) {
				writeManager(writer, managerON, mBeanServer, mode);
			}
			if (jspMonitorONs != null) {
				writeJspMonitor(writer, jspMonitorONs, mBeanServer, mode);
			}
			writer.print("</p>");

			String onStr = objectName.getDomain()
					+ ":j2eeType=Servlet,WebModule=" + webModuleName + ",*";
			ObjectName servletObjectName = new ObjectName(onStr);
			Set<ObjectInstance> set =
					mBeanServer.queryMBeans(servletObjectName, null);
			Iterator<ObjectInstance> iterator = set.iterator();
			while (iterator.hasNext()) {
				ObjectInstance oi = iterator.next();
				writeWrapper(writer, oi.getObjectName(), mBeanServer, mode);
			}

		} else if (mode == 1) {
			// for now we don't write out the context in XML
		}

	}

	/**
	 * Write detailed information about a manager.
	 */
	public static void writeManager(PrintWriter writer, ObjectName objectName,
	                                MBeanServer mBeanServer, int mode)
			throws Exception {

		if (mode == 0) {
			writer.print("<br>");
			writer.print(" Active sessions: ");
			writer.print(mBeanServer.getAttribute
					(objectName, "activeSessions"));
			writer.print(" Session count: ");
			writer.print(mBeanServer.getAttribute
					(objectName, "sessionCounter"));
			writer.print(" Max active sessions: ");
			writer.print(mBeanServer.getAttribute(objectName, "maxActive"));
			writer.print(" Rejected session creations: ");
			writer.print(mBeanServer.getAttribute
					(objectName, "rejectedSessions"));
			writer.print(" Expired sessions: ");
			writer.print(mBeanServer.getAttribute
					(objectName, "expiredSessions"));
			writer.print(" Longest session alive time: ");
			writer.print(formatSeconds(mBeanServer.getAttribute(
					objectName,
					"sessionMaxAliveTime")));
			writer.print(" Average session alive time: ");
			writer.print(formatSeconds(mBeanServer.getAttribute(
					objectName,
					"sessionAverageAliveTime")));
			writer.print(" Processing time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "processingTime"), false));
		} else if (mode == 1) {
			// for now we don't write out the wrapper details
		}

	}

	/**
	 * Write JSP monitoring information.
	 */
	public static void writeJspMonitor(PrintWriter writer,
	                                   Set<ObjectName> jspMonitorONs,
	                                   MBeanServer mBeanServer,
	                                   int mode)
			throws Exception {

		int jspCount = 0;
		int jspReloadCount = 0;

		Iterator<ObjectName> iter = jspMonitorONs.iterator();
		while (iter.hasNext()) {
			ObjectName jspMonitorON = iter.next();
			Object obj = mBeanServer.getAttribute(jspMonitorON, "jspCount");
			jspCount += ((Integer) obj).intValue();
			obj = mBeanServer.getAttribute(jspMonitorON, "jspReloadCount");
			jspReloadCount += ((Integer) obj).intValue();
		}

		if (mode == 0) {
			writer.print("<br>");
			writer.print(" JSPs loaded: ");
			writer.print(jspCount);
			writer.print(" JSPs reloaded: ");
			writer.print(jspReloadCount);
		} else if (mode == 1) {
			// for now we don't write out anything
		}
	}

	/**
	 * Write detailed information about a wrapper.
	 */
	public static void writeWrapper(PrintWriter writer, ObjectName objectName,
	                                MBeanServer mBeanServer, int mode)
			throws Exception {

		if (mode == 0) {
			String servletName = objectName.getKeyProperty("name");

			String[] mappings = (String[])
					mBeanServer.invoke(objectName, "findMappings", null, null);

			writer.print("<h2>");
			writer.print(filter(servletName));
			if ((mappings != null) && (mappings.length > 0)) {
				writer.print(" [ ");
				for (int i = 0; i < mappings.length; i++) {
					writer.print(filter(mappings[i]));
					if (i < mappings.length - 1) {
						writer.print(" , ");
					}
				}
				writer.print(" ] ");
			}
			writer.print("</h2>");

			writer.print("<p>");
			writer.print(" Processing time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "processingTime"), true));
			writer.print(" Max time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "maxTime"), false));
			writer.print(" Request count: ");
			writer.print(mBeanServer.getAttribute(objectName, "requestCount"));
			writer.print(" Error count: ");
			writer.print(mBeanServer.getAttribute(objectName, "errorCount"));
			writer.print(" Load time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "loadTime"), false));
			writer.print(" Classloading time: ");
			writer.print(formatTime(mBeanServer.getAttribute
					(objectName, "classLoadTime"), false));
			writer.print("</p>");
		} else if (mode == 1) {
			// for now we don't write out the wrapper details
		}

	}

	/**
	 * Filter the specified message string for characters that are sensitive
	 * in HTML.  This avoids potential attacks caused by including JavaScript
	 * codes in the request URL that is often reported in error messages.
	 *
	 * @param obj The message string to be filtered
	 */
	public static String filter(Object obj) {

		if (obj == null)
			return ("?");
		String message = obj.toString();

		char content[] = new char[message.length()];
		message.getChars(0, message.length(), content, 0);
		StringBuilder result = new StringBuilder(content.length + 50);
		for (int i = 0; i < content.length; i++) {
			switch (content[i]) {
				case '<':
					result.append("&lt;");
					break;
				case '>':
					result.append("&gt;");
					break;
				case '&':
					result.append("&amp;");
					break;
				case '"':
					result.append("&quot;");
					break;
				default:
					result.append(content[i]);
			}
		}
		return (result.toString());

	}

	/**
	 * Display the given size in bytes, either as KB or MB.
	 *
	 * @param mb true to display megabytes, false for kilobytes
	 */
	public static String formatSize(Object obj, boolean mb) {

		long bytes = -1L;

		if (obj instanceof Long) {
			bytes = ((Long) obj).longValue();
		} else if (obj instanceof Integer) {
			bytes = ((Integer) obj).intValue();
		}

		if (mb) {
			StringBuilder buff = new StringBuilder();
			if (bytes < 0) {
				buff.append('-');
				bytes = -bytes;
			}
			long mbytes = bytes / (1024 * 1024);
			long rest =
					((bytes - (mbytes * (1024 * 1024))) * 100) / (1024 * 1024);
			buff.append(mbytes).append('.');
			if (rest < 10) {
				buff.append('0');
			}
			buff.append(rest).append(" MB");
			return buff.toString();
		} else {
			return ((bytes / 1024) + " KB");
		}

	}

	/**
	 * Display the given time in ms, either as ms or s.
	 *
	 * @param seconds true to display seconds, false for milliseconds
	 */
	public static String formatTime(Object obj, boolean seconds) {

		long time = -1L;

		if (obj instanceof Long) {
			time = ((Long) obj).longValue();
		} else if (obj instanceof Integer) {
			time = ((Integer) obj).intValue();
		}

		if (seconds) {
			return ((((float) time) / 1000) + " s");
		} else {
			return (time + " ms");
		}
	}

	/**
	 * Formats the given time (given in seconds) as a string.
	 *
	 * @param obj Time object to be formatted as string
	 * @return String formatted time
	 */
	public static String formatSeconds(Object obj) {

		long time = -1L;

		if (obj instanceof Long) {
			time = ((Long) obj).longValue();
		} else if (obj instanceof Integer) {
			time = ((Integer) obj).intValue();
		}

		return (time + " s");
	}

}
